MLA

Sayers, James, 1748-1823, printmaker. Robespierre [graphic]. [12 May 1794]. https://collections.library.yale.edu/catalog/10939087.

APA, 6th edition

Sayers, James, 1748-1823, printmaker. ([12 May 1794])[Robespierre [graphic]]. https://collections.library.yale.edu/catalog/10939087.